AD684 Analog Devices Data Handbook/Manual

Four-Channel

Sample-and-Hold Amplifier

AD684*

FEATURES FUNCTIONAL BLOCK DIAGRAM Four Matched Sample-and-Hold Amplifiers Independent Inputs, Outputs and Control Pins ns Hold Mode Settling ms Maximum Acquisition Time to 0.01% Low Droop Rate: 0.01 m V/ms Internal Hold Capacitors 75 ps Maximum Aperture Jitter Low Power Dissipation: 430 m W 0.3" Skinny DIP Package MIL-STD-883 Compliant Versions Available

PRODUCT DESCRIPTION PRODUCT HIGHLIGHTS The AD684 is a monolithic quad sample-and-hold amplifier 1. Fast acquisition time (1 µs) and low aperture jitter (75 ps) (SHA). It features four complete sampling channels, each make the AD684 the best choice for multiple channel data controlled by an independent hold command. Each SHA is acquisition systems. complete with an internal hold capacitor. The high accuracy

2. Monolithic construction insures excellent interchannel

SHA channels are self-contained and require no external

matching in terms of timing and accuracy, as well as high

components or adjustments. The AD684 is manufactured on a

reliability.

Bi MOS process which provides a merger of high performance w.BDTIC.com/ADI

3. Independent inputs, outputs and sample-and-hold controls

bipolar circuitry and low power CMOS logic.

allow user flexibility in system architecture.

The AD684 is ideal for high performance, multichannel data

4. Low droop (0.01 µV/µs) and internally compensated hold

acquisition systems. Each SHA channel can acquire a signal in

mode error results in superior system accuracy.

less than 1 µs and retain the held value with a droop rate of less than 0.01 µV/µs. Excellent linearity and ac performance make 5. The AD684’s fast settling time and low output impedance the AD684 an ideal front end for high speed 12- and 14-bit make it ideal for driving high speed analog to digital ADCs. converters such as the AD578, AD674, AD7572 and the

AD7672.

The AD684 has a self-correcting architecture that minimizes hold mode errors and insures accuracy over temperature. Each 6. The AD684 is available in versions compliant with MIL- channel of the AD684 is capable of sourcing 5 m A and STD-883. Refer to the Analog Devices Military Products incorporates output short circuit protection. Databook or current AD684/883B data sheet for detailed

specifications.

The AD684 is specified for three temperature ranges. The J grade device is specified for operation from 0 to +70°C, the A grade from –40°C to +85°C and the S grade from –55°C to +125°C.

*Protected by U.S. Patent Number 4,962,325.

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